diff --git a/src/main/c/global.h b/src/main/c/global.h
index 556a1f1..1dea8db 100644
--- a/src/main/c/global.h
+++ b/src/main/c/global.h
@@ -5,4 +5,8 @@ typedef enum {
     N, E, S, W
 } Direction;
 
+typedef enum {
+    WAY, WALL, SOLUTION
+} State;
+
 #endif
\ No newline at end of file
diff --git a/src/main/c/labyrinth.c b/src/main/c/labyrinth.c
index ba08944..7b13e6e 100644
--- a/src/main/c/labyrinth.c
+++ b/src/main/c/labyrinth.c
@@ -43,3 +43,7 @@ void lab_move(unsigned short *x, unsigned short *y, Direction direction){
 
 }
 
+void set_wall(State** field, unsigned short x, unsigned short y) {
+    field[0][0] = WALL;
+}
+
diff --git a/src/main/c/labyrinth.h b/src/main/c/labyrinth.h
index 3bd9821..15cd364 100644
--- a/src/main/c/labyrinth.h
+++ b/src/main/c/labyrinth.h
@@ -5,5 +5,6 @@
 
 void turn_direction_right(Direction *direction);
 void lab_move(unsigned short *x, unsigned short *y, Direction direction);
+void set_wall(State** field, unsigned short x, unsigned short y);
 
 #endif // TEST_H
diff --git a/src/test/c/test_labyrinth.c b/src/test/c/test_labyrinth.c
index 98d4f2f..f950838 100644
--- a/src/test/c/test_labyrinth.c
+++ b/src/test/c/test_labyrinth.c
@@ -200,3 +200,34 @@ void test_lab_move_from_5_5_W_expected_5_4(void)
 	TEST_ASSERT_TRUE(x == x_expected && y == y_expected);
 }
 
+void test_set_wall_at_0_0_expected_WALL(void)
+{
+    /* arrange */
+	unsigned short x = 0;
+	unsigned short y = 0;
+	
+	unsigned short len_x = 1, len_y = 1;
+    State **field;
+
+    field = malloc(len_x * sizeof *field);
+    for (int c_index = 0; c_index < len_x; c_index++){
+        field[c_index] = malloc(len_y * sizeof field[c_index]);
+    }
+	
+	field[x][y] = WAY;
+	
+	State expected = WALL;
+
+    /* act */
+    set_wall(field, x, y);
+
+    /* assert */
+	TEST_ASSERT_TRUE(field[x][y] == expected);
+
+    for (int c_index = 0; c_index < len_x; c_index++)
+    {
+        free(field[c_index]);
+    }
+    free(field);
+}
+